Machine for inserting screw-threaded wire



(No Model.) I v 4 sheets-sheet- 1. S. W. ROBINSON.

MACHINE FOR INSBRTING SCREW THREADED WIRE. No. 554,200. Patented PebJl, 1896..

(11o Mqdel.) 4 Sheets-Sheet 2.

v S. W. ROBINSON, H MACHINE PORINSEBTINGSOREW THREADED WIRE.

N0.- 554,200. Patente .e 4 3';

an: A at H imm 4 -Sheets-Shee 3.

(No Model.)

s. ROBINSON. MACHINE FOR INSERTING SGREW THREADED WIRE. No. 554,200.

Patented Feb. 4, 1896.

J; 7 J r- (No Model.) '4 Sheets-Sheet 4.

S. W. ROBINSON. MACHINE FOR INSBRTING SGRBW THREADED WIRE.

No. 554,200. Patented Feb. 4,. 1896.

20%nessea, .Ziavewoar W/ 3 M a a AN DREW BANANA". PHOTO-THO. WASHINGTON. DC

UNITED STATES PATENT- OFFICE.

STILLMAN \V. ROBINSON, OF COLUMBUS, OHIO, ASSIGNOR TO THE \VIRE GRIP FASTENING COMPANY, OF CHICAGO, ILLINOIS.

MACHINE FOR INSERTING SCREW-THREADED WIRE.

SPECIFICATION forming part of Letters Patent No. 554,200, dated February 4, 1896.

Application filed March 19, 1895. $eria1No. 542,308. (No model.)

To all whom, it may concern:

Be it known that I, STILLMAN WV. ROBINSON,

of Columbus, county of Franklin, State of Ohio, have invented an Improvement in Machines for Inserting Screw-Threaded ire, of which the following description, in connection with the accompanying drawings, is a specification, like letters and numerals 011 the drawings representing like parts.

This invention has for its object the production of an improved machine for inserting screw-threaded wire into soles, &c., in the manufacture of boots and shoes and other work.

In the machine to be herein described the end of a wire is screwed into the stock, the term used to designate the leather of the sole or other work, and is then cut off to produce a fastening, each fastening being made of just the proper length for the thickness of the stock at the point where the same is to be united, variations in length of fastenings being auto matically determined, as will be hereinafter described.

I have provided novel means whereby the feed movement of the wire being screwed into the stock is made positive and sub stantially uniform while entering the stock, and then the wire-feeding spindle is raised quickly, and to effect this I employ IlOIlOll cular gearing.

I have mounted one of thetwo feed-rolls at the lower end of the rotating hollow spindle in a movable part or frame having combined with it a suitable spring whereby the degree of pressure with which the feed-rolls grasp the wire maybe adjusted. I have also mounted the wire-feeding wheels in a novel manner, whereby they are enabled to run with a minimum of friction. I have also mounted the hollow rotating wire-carrying spindle in bearings which are free to tip or oscillate somewhat, as may be required, to prevent the undue friction and heating of the spindle when being rotated rapidly.

One part of my invention consists in a rotatable spindle provided with a two-part head, feeding-wheels mounted in said head, and a spring acting on one part of said head to hold its feed-wheel in a yielding manner. toward the feoLl-nhoelof ihe other part of said head,

substantially as will be described; also, in a machine for inserting screw-threaded wire, means to support the work, a wire-carrying spindle supported at its upper end ina bearing and provided below said bearing with a fixed collar, a bearing to sustain said collar, and a cross-head to sustain said bearing, combined with a lever to reciprocate said crosshead to lift said bearing and spindle, and means to rotate said spindle; also, in the cutter carrying levers having arms provided with toothed sectors, and a threaded block engaged by and between said sectors, c01nbined with an upright shaft having a quick thread to engage said block.

Other features of my invention will be hereinafter described in the specification and particularly'pointed out in the claims.

Figure 1, in front elevation, represents the upper part of the machine containing my present improvements, aportion of the framework and other parts being partially broken out to show parts behind; Fig. 1, a detail to show part of the apparatus for actuating the wirecutting mechanism; Fig. 2, a left-hand side elevation of the machine shown in Fig. 1. Fig. 2 shows part of the gear (I and some of its holes (Z Fig. 3 is a section below the line as, chiefly to show the non-circular gears and compound eccentric actuated by or through them to effect the feeding of the wire and the raising and lowering of the spindle; .Fig. 3, a detail of the outer or ring-like part 6 of the compound eccentric. Fig. 4 is a sectional detail showing the head at the lower end of the revolving hollow wire-carrying spindle through which the wire is fed by the feedrolls. Fig. 5 is a section in the line as, Fig. 4, the line :0 showing the line of section for Fig. 4. Fig. 6 is a detail showing part of the wire-cutting mechanism Fig. 7, details of the clutch mechanism to be described; Fig. 8, a detail of the annular multitoothed pawl, shown also in Figs. a and 5; Fig. 9, a sectional detail in the line :0 Fig. 5. Fig. 10 is a top view of the wire-holder fixed to the upper end of the spindle, and Fig. 11 is a section of Fig. 10 in the dotted line y y.

The framework or column A of the machine, said column having in practice feet to rest upon the floor, is and may be of suitable shape to sustain the various working parts to be described. The framework has at its upper end a suitable chamber, in which is placed a box A, having at its exterior a semispherical or ball-like projection or enlargement resting on a semispherical seat A said box receiving within it and serving as a bearing for the hollow spindle B, the box being free to tip or oscillate to compensate for gyrating motions orvibrations of the spindle when being run rapidly.

The upper end of the box A is enlarged and hollowed out to constitute an oil-well, in which is placed suitable lubricating material.

The upper end of the spindle has fast on it a pulley B driven continuously from any suitable shaft, all the motions of the various different working parts being derived from said spindle. The pulley B has atop flange, B provided with suitable ears B to which are connected by suitable bolts B ears B of a wire-holder B the said ears having, as shown, slots with large ends B to fit easily over the bolts, the said slots enabling the holder to be removed without moving the bolts. The wire-holderB is open at its lower side to receive therein the coil of wire, which is held in place by a plate B (see Fig. 11,) detachably secured to the holder by suitable ears, as B or in any other suitable manner, the periphery of the plate having enlarged portions B to be brought into engagement with the ears by slight rotation of the plate, maintaining it in position. A central opening, B in the plate permits the passage of the wire therethrough, the plate resting on the ears B By this construction the operator is enabled to place the coil of wire in the holder B when removed from the machine and turned upside down, and the plate B is then applied and secured, after which the ties of the coil are removed, and the coil is thus retained in the holder when turned over and placed on the machine.

The holder lies flat with the axis of the coil of wire coinciding with the wire-receiving hole of the spindle, and the pulley-space between the holder and the spindle is cut away to provide a conical passage in which the wire may gyrate as the latter is drawn from the central opening of the coil of wire without rotating the latter relative to the spindle. The wire to will be led from said holder or coil down through the center of the spindle, all as required in screw-wire machines of the class upon which this is intended as an improvement, the coil of wire rotating continuously with the spindle as the wire is being consumed in the machine.

The lower end of the spindle B has (see Fig. 4) a two-part yoke or head 13 and B the part B being mounted upon the part B by pivot a, the upper end of the part B being shaped to receive loosely a suitable spring a, preferably made as a washer, which at its center receives the head of a stud-screw a a collar a of the stud-screw acting against the inner side of the spring, (see Fig. 4,) the stud-screw entering a threaded hole in the block a attached to the part 13 of the head, the rotation of said stud-screw in one or the other direction causing it to act with greater or less force upon said spring, and consequently pressing the lower end of the part B of the head toward the part B The head referred to has screwed into it three sets of bearings B all substantially alike, said bearings being represented (see Fig. as screws chambered at their inner ends to constitute oil-cups, said cups receiving loosely the ends of the axles B B and B, the chambers in the sleeve-bearings being large and deep enough to retain oil and keep said axles well lubricated, the oil being retained in the chambers or cups by centrifugal force. The axles B and B are mounted in the part B of the head and the axle B in the part B of the head. The axle 13 receives upon it the feed-wheel B" and the axle B the feed-wheel B while the axle B receives upon it the long sleeve-like extension e from the ratchet-wheel B The feed-wheel B has a sleeve-like hub B projecting from it in each direction, and one end of the hub has fixed to it a pinion B, which engages a pinion B (see Fig. 9) fast on a like sleeve-hub of the feed-wheel B The pinion B is engaged by an intermediate pinion B (see Fig. 5) supported on a stud 13 carried by the part B of the head, the pinion B being driven by a pinion B made, as herein shown, as a toothed ring (see Fig. 5) screwed onto the end of the long sleeve c0 of the wheel B loose on the axle B. The ratchet-wheel B is toothed at its periphery and also toothed at its inner side, as at 0, (see Fig. 4,) the peripheral teeth being engaged by a suitable pawl B (shown by dotted lines, Fig. 4,) which acts to prevent retrograde rotation of said ratchet-wheel and also the pinion B.

The sleeve c of the ratchet-wheel B is surrounded loosely by a lon sleeve-like pinion C, having at its periphery an annular groove to permit the wire 20 to pass said pinion, and said pinion is provided with an annular pawl 0, made as a ring, having teeth at its side next said ratchet-wheel, said pawl being borne by a suitable spring C against the teeth 0 at the inner side of the ratchetwheel B the interior of the washer-shaped pawl being notched (see Fig. 8) to enable it to slide on and yet be moved by the teeth at the end of the pinion O. The pinion O is engaged by a toothed rack C grooved longitudinally opposite the annular groove of the pinion, said rack being fitted to slide up and down in a longitudinal groove out in one side of the hollow spindle B, the rack being connected in suitable manner, as by screws a, (see Fig. 4,) with a sleeve 0 having at its upper end (see Fig. 1) a flange 2,which rests on an inwardly-projecting flange of a ring 3, suitably attached to a ring 4, the two rings when suitably united, as by a screw-thread or otherwise, (see Fig. 1,) being embraced by and seated loosely in a strap or yoke having gimbal-journals, which are mounted in like arms of a bell-crank lever C" pivoted at 0 upwardlyextended arms of said lever having fixed in them a pin 100 inserted loosely through holes in cars of an eccentric-strap C ,which surrounds a compound or two-part eccentric 6, the part 5 (see Fig. 8) being made preferably as integral with the hub of the non-circular gearD, to be described, and the part 6 as an eccentric-ring, the said lever, the ring C and parts actuated thereby having a definite positive stroke with relation to the horn 12 which remains at a c011- stant height.

The rings 3 and 4c and the surrounding ring C constitute what in the claims I designate as a strap or yoke.

The gear D is free to revolve on a stud '7, and has (see Fig. 3) a hole which is entered by a key 8, said key being adapted to enter either one of the two half-circular holes 1012 made in the ring-like outer eccentric, 6,when (see Fig. 3) either one of said holes is opposite the half-hole in the eccentric 5, the ad justment of the ring-like eccentric 6 about the eccentric 5 enabling the spindle to be moved for a greater or less distance, as may be required, the key 8 entering the partial hole 12 in said eccentric 6 when the stock is thick and the partial hole 10 when the stock is thin, it having been found advantageous to provide for a longer or shorter stroke of the spindle to better adapt the machine for thick or thin work and to increase the number of screws inserted in a given time for this Work.

The ring 4 has at its interior a semispherical seat (see Fig. 1) for a buffer-ring 19, having a semispherical lower end to rest on said seat, the upper end of the buffer-ring being provided with a suitable leather or other washer Z), on which rests loosely the central part of the main cross-head B instrumental in sustaining the nose or presser plate I9 and the wire-cutting mechanism to be described.

The cross-head B has ears Z2 to which by suitable set-screws are connected slide-rods b b extended through suitable guides b b forming part of the framework, and at their lower ends said slide-rods have attached to them the auxiliary cross-head Z2 to which in turn is attached the nose or presser plate h which rests upon the stock supported upon a horn D in usual manner, said horn and noseplate being common to United States Patent No. 325,274, dated September 1, 1885.

The cross-head B is shown as having adjustably mounted upon it two standards V to the upper ends of which are attached strong spiral springs 6 the lower ends of said springs being shown as attached to ears of the lever c", said springs normally acting to keep the presser-plate 5 seated on the stock and hold the cross-head Z1 toward the buffer-rin g referred to. The cross-head B (see Fig. 1) has at its interior a semi- 16, the latter serving as an additional hearing for the spindle B, the upper end of said box 16 being enlarged to form a cup 16 to contain a suitable supply of oil.

The spindle B above the box 16 has fixed to it a collar b (best shown in Fig. 1,) it having at its under side a suitable lip or projection to enter a notch in aring I), which rests loosely on a suitable shoulder of the box 16, said collar and ring being thus gimbal-j ointed one with relation to the other. The spindle B is made in two parts screwed together at 66, (see Fig. 1,) and at the junction of said parts I have added a ring 20, which contacts with the lower end of and keeps the box 16 up against the ring 19 The spindle B above collar b is cut to form or is provided with a long pinion 21, which engages the teeth of a gear 01 made fast to a pinion cl mounted loosely on a stud d suitably connected to the framework. The pinion d engages a gear (1 which is thus rotated continuously with the spindle B.

Just below the center of rotation of the gear 01 is a non-circular gear (31, (see Fig. 3,) which engages the non-circular gear D, and between the non-circular gear (1 and the gear 01 I have provided a clutch mechanism, which, when it is desired to start the nailing, may be made to couple the gear d with the gear 01 and which may be moved to release the gear (I from the gear d when it is desired to stop the nailing to remove a shoe, or for other purposes.

The clutch device, as herein shown, consits essentially of a bolt (:1 free to slide in a suitable hole in the hub of the non-circular gear d a suitable spring c1 (see Fig. 7) acting normally to move said bolt in the direction to cause it to engage the continuously-rotating gear at above it, said bolt entering one or another of a series of holes d in said gear. (See Fig. 2, where a part of said gear is shown.) The hub of the gear 61 is quite long and surrounds a fixed stud d, and at its lower end (see Fig. 2) said hub has a suitable cam (F, to be hereinafter described, which serves to impart motion to the shoe-feeding mechanism. The bolt (1 has a projection cl, with which co-operates a clutch-releasing device 61 under the control of a suitable treadle (not shown) located at the floor, said treadle having connected to it a rod (1 (partially shown in Fig. 2,) which is extended up through a hole in the column A, and is connected at 102 to one arm of an elbow-lever d", pivoted at d on the framework, said lever having a third upwardly-extended arm 01 preferably forked,'as shown by dot-ted lines in Fig. 2, to engage an arm (1 of the clutchactuator, herein shown as a three-armed lever or rocker mounted on and so as to turn loosely about a vertical stud (1, said lever or rocker having other arms or projections (Z (1". (See ICC Fig. 3.) The arm (1 of the actuator (see Fig. 3) has pivoted on it an arresting device (Z it having its inner or acting end provided with a hook or projection to engage the corner of a block (1 fast to the non-circular gear 01 as in Fig. 3, the parts shown in said figure being supposed to be in the position occupied by them when the wire-feeding and spindle-reciprocating devices are at rest, the spindle, however, rotating and revolving the toothed gear (Z from which the bolt (1 is withdrawn.

When the machine is at rest, as described, a spring c1 connected to said arresting device d acts to keep the latter in the position shown, and also to hold the clutch-actuator in such position that the releasing device (Z serves to depress the bolt (Z against spring 66 Now if the workman desires to start the machine in operation to insert fastenings he will put his foot upon said treadle and turn the clutch-actuator about stud (1 so as to remove the releasing device laterally from contact with the said bolt, letting the spring (1 act to move the bolt and project the same from thehub of the non-circular gear d into one of a series of holes (Z in the continuously-rotating gear C1 and at the same time the arresting device is moved from engage ment with the block (Z When the nailing is to be stopped the operator will remove his foot from the treadle and let the spring 61 referred to, act and move the releasing device (Z toward the said bolt, so as to presentthe inclined part thereof (see detail Fig. 7) in the line of movement of the projection d of the bolt (Z as the latter travels with the gear d thus withdrawing said bolt from engagement with the gear d The non-circular gear 1 engages and drives the non-circular gear D, before referred to, having the compound eccentrics 5 6. These gears are made non-circular or shaped substantially as shown, in order that the spindle B, when being moved downwardly, may travel at a uniform speed, the speed being adjusted to the pitch of the threads on the wire w, and also that the spindle may be returned quickly or make its upward stroke quickly at a variable speed.

If the movement of the lever C" was produced by a crank or eccentric actuated by a shaft revolving at a uniform speed, the strap or yoke and its connected rack would have a variable-rate of descent as the crank traveled toward its so-called deadcenter, which is objectionable.

In order to complete with ease the rotation of the peculiar non-circular gears in either direction of rotation, I have provided the gear (1 at its under side with a tooth 01 (shown by dotted lines, Fig. 3,) which engages a tooth 24 of similar shape at the upper side of the non-circular gear D.

The position of the compound eccentric 6 shown is right for the long stroke of the machine. For the short stroke the part f the compound eccentric must be turned half-way around, and the pinion d must be changed for a larger one, which necessitates another position for the stud d in the frame A, and for this change I have provided asecond hole d (See Fig. 2.)

The gearD is provided with a cam projection 25, which at each rotation of said gear strikes a wing 26 at the upper end of a rod 27, (shown separately in Fig. 6,) it having multiple-threaded portions 28 and 30, or portion provided with two or more screwthreads of long pitch to facilitate quick action of the threads with a long throw of the parts moved thereby and with but little rotation of said rod. The threaded part 28 enters a suitable threaded bearing 29 fixed in the framework, and the threaded part 30 engages a screw-thread in a rack-block 31. As the rod 27 is rocked, it is moved quickly vertically in its bearings, and at the same time the threaded part 30, in engagement with the rack-block 31, lifts the latter quickly, so that its external teeth, in engagement with the toothed arms 32 of the rocking levers 33, (see Figs. 1 and 2,) move said levers quickly about the studs 34, upon which they are mounted, said studs being sustained in suitable ears of the auxiliary cross-head 5 before referred to. Suitable ears of the rocking levers 33 receive removable pivots 36, on which are mounted carriers 37, which receive and hold the shanks of the cutters or chisels 38, which act to cut off the wire close to the surface of the stock after said wire shall have been screwed into the stock and through the same to the horn, said cutters or chisels being free to slide in diagonal holes made in the nose-plate Z2 resting, as described, on the stock.

As before stated, the upper or main crosshead, 13 is kept seated when the nose-plate is off the work, but in ayielding manner, upon the buffer-ring and during the descent of the spindle as the latter is being moved down by the elbow-lever 0 As soon as the nose-plate meets the stock resting on the horn, the further descent of the cross-head B is arrested, but the elbow-lever C continues to move, and in its further movement depresses or lowers the sleeve 0 having the rack-bar C and causes the latter, in engagement with the pinion C, to rotate the wire-feeding wheels grasping the wire between them, causing said wheels to feed the wire out from the head into the stock below the nose-plate.

The foot-lift D, the sleeve D to which it is attached, the stud D on which it is adjustable vertically, the sole-feeding bar m free to be slid back and forth in a rocking block mounted on an arm D said feeding-bar being moved forward to engage the edge of the sole by a ca1n-finger 7r of a depending leg or link pivoted on the leverfor moving the spindle up and down are and may be all substantially as in United States Patent No. 447,358, dated March 3, 1891. In this present invention the feeding movement of the bar on is effected by the cam. projection (1 before referred to, moving in unison with the non-circular gear (1, it acting (see Fig. 2) on a projection t of an arm t fast on a rock-shaft 15 having at its lower end a finger t, which, as the shaft 2? is moved to push the finger against the feed-bar m, effects the feeding movement thereof, a spring 25 connected to said feedbar (see Fig. 2) and to a fixed part of the frame, (see Fig. 1,) restoring said feed-bar to its starting-point against a stop Having described my invention, what I claim as new, and desire to secure byLetters Patent, is-

1. In a machine for inserting screw-threaded wire, a rotatable spindle provided with a two-part head, feeding-wheels mounted in said head, and a spring acting on one part of said head to hold its feed-wheel in a yielding manner toward the feed-wheel of the other part of said head, substantially as described.

2. The rotatable spindle, its feed-wheels, and a shaft having a gear-wheel and a ratchet wheel, combined with a wheel surrounding said shaft and provided with an annular pawl to engage said ratchet-wheel, and a rack to move said shaft and pawl, substantially as described.

3. Means to support the work; a wire-carrying spindle supported near its upper end in a bearing, and provided below said bearing with a fixed collar; a bearing to sustain said collar and a cross-head to sustain said hearing, combined with a lever, a strap or yoke movable thereby through a definite stroke to reciprocate said cross-head to lift said bearing and spindle, and means to rotate said spindle, substantially as described.

4. In a machine for inserting screw-threaded wire, a rotatable spindle provided with wire-feeding devices, and having an attached ring, a box supporting said ring, and a collar fixed to said spindle, combined with a crosshead having a seat to support said box loosely, substantially as described.

5. The cutter-carrying levers having arms provided with toothed sectors, and a threaded block engaged by said sectors, combined with an upright shaft having a quick thread to engage said block, substantially as described.

6. The cutter-carryin g levers having arms provided with toothed sectors, and a threaded block engaged by said sectors, combined wit-h an upright shaft having a quick thread to engage said block, and having a second threaded part above it, a threaded box for said second threaded part, and means to rotate said shaft, substantially as described.

7. The cutter-carrying levers having arms provided with toothed sectors, and a threaded block engaged by said sectors, combined with an upright shaft having a quick thread to engage said block, and with means to raise said rod, substantially as described.

8. The rotating spindle, wire-feeding mechanism carried thereby, the sleeve 0 the yoke embracing the said sleeve, and the lever 0 combined with the non-circular gears D and cl, and devices intermediate the said gear D and the said lever, to move the latter, substantially as described.

9. The combination with the non circular gears employed in feeding the wire, and the revolving spindle and intermediate actuating devices, of clutch mechanism, as described, for stopping and starting the nailing while the spindle continues its rotation, substantially as described. 7

10. The combination with the rotating wirecarrying spindle and feed-wheels, of bearings screwed into the head of the spindle and having deep chambers for the reception of the axles of the feed-wheels, said bearings retaining oil and keeping the feed-wheel axles lubricated, substantially as described.

11. The wire-carrying spindle, the lever to actuate it, connections between said lever and said spindle, the eccentric-strap connected to said lever, an adjustable two-part eccentric,

a non-circular gear to which said eccentric is attached, and gearing between said non-circular gear and said spindle whereby the stroke of the spindle may be varied, substantially as described.

12. The wire-carrying spindle, the box 16, the sleeve 0 a strap or yoke to sustain said sleeve, wire-feedin g mechanism supported on said spindle, and devices between said sleeve and said feed mechanism to actuate the latter, the lever C jointed to said strap or yoke, the cross-head 13 to sustain said box, and the connected nose-plate, combined with devices to move said lever and impart to said sleeve a definite positive stroke, substantially as described.

13. In a nailing'machine for uniting soles to uppers with screw-wire having threads of uniform pitch, a revolving spindle having wire-feeding mechanism, non-circular gears, and mechanism actuated thereby to feed the wire at a uniform rate, and to then make the return stroke of p the feeding mechanism quickly, substantially as described.

14. The wire-cutting-oft chisels 3S sliding by one end in the nose-plate, with the other end made fast adjustably in the chisel-carriers 37, and operated by the elbow-levers 33 engaging the rack-block 31, the latter working on the steep-threaded screw 27', as described.

15. In a screw-wire-n ailing machine for fastening soles to uppers, the combination of the followin g instrumentalities,viz :a work-supporting horn of constant height; a revolving wire-carrying spindle supported on a cross head connected to a nose-piece and adapted to be arrested as the nose-plate meets the stock on the horn, wire-feeding mechanism, a strap or yoke supporting said cross-head when the latter is not resting by its nose-plate on the stock, mechanism connected with the said strap or yoke to impart to it a definite constant stroke, and devices between the strap or yoke and the said wire-feedin g mechanism, substantially as described.

16. Means to support the work, a wire-can rying spindle, a connected ring, a bearing to support said ring, a cross-head to sustain said bearing, a strap or yoke to sustain said crosshead, a sleeve connected to said strap or yoke, and a lever to move said strap or yoke, combined with wire-feeding mechanism, and devices intermediate said strap or yoke and wire-feeding mechanism to actuate the latter more or less during the descent of said strap or yoke according to the thickness of the stock, substantially as described.

17. The rotating wire-conveying spindle and its attached ring, the box 16, the strap C its attaching-lever, the two-part ring 2, i, and the buffer-ring combined with the cross-head to sustain said box and spindle, substantially as described.

18. The spindle, its pivoted member B having a screw-hole and the spring a, combined with the screw a extended through said spring and having a shoulder to engage the spring, substantially as described.

19. The gear d the ear D and the gear d provided With a sliding pin and mounted with relation to gear (i combined with a releasing device and means to move it to control the said pin, substantially as described.

20. The gear D having a hub, an eccentricring surrounding said hub, and an eccentricstrap surrounding said ring combined with a pin to hold said ring in one of two positions on said hub, substantially as described.

21. The spindle and its attached pulley having a flaring opening at its upper side, combined with the covering-plate extending across the upper side of the coil of Wire, and devices to connect portions of said coveringplate to the said pulley, said parts being arranged to present the open center of the coil of wire about the wire-passage in the spindle, substantially as described.

22. The spindle and its attached pulley having a flaring opening at its upper side, combined with a wire-holder having upper and lower annular retaining-plates to hold the Wire and connected to the said pulley, and to present the open center of the coil of wire about the wire-passage in the spindle, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

STILLMAN W. ROBINSON.

Witnesses:

JOHN C. EDWARDS, MARGARET A. DUNN. 

